Only if I can't remember much of the plot details, but do know it was a fucking awesome series.
I'll probably rewatch Phantom ~Requiem of the Phantom~ in about a year.
I do, and I also like to put series I've already watched on while I'm doing other work. Gurren Lagann is on the top of my list because it keeps me pumped and motivated (hence my freakout to find it streaming on netflix) while working. I love specific episodes of Mushishi and all of Mononoke (not princess mononoke, the actual series based around a medicine seller).
I mostly re-watch anime movies like 5 cm/sec, Summer Wars, and anything by Ghibli Studios. The last anime series I re-watched was Gundam Wing for nostalgia purposes.
I rewatched elfen lied, higurashi no naku koro ni, saiyuki, evangelion and this other one that isnt coming to mind....and probably another...but thats it.
Hajime No Ippo as a guess-timate about 5 times, and a whole lot of other Animes!
Shuffle, The Melancholy Of Haruhi Suzumiya, Rumbling Hearts, True Tears, Black Lagoon, Full Metal Panic series, All Purpose Cultural Cat Girl Nuku Nuku, Berserk, Outlaw Star, Initial D series, Clannad (+ After Story) ETC ETC
Yes. School Days whenever I'm bored, Shuffle! when I feel like watching Kaede go crazy, and other stuff. B ut usually I skip to the parts I wanna watch.
hmmm, only the ones that I really love, E.F is one of them, Clannad too, sometimes I just watch the best moments, like the telephone scene in EF, 100 seconds of drama.
Also rewatch Ghibli films many times, they are works of genius
Lastly there is Sayonara, Zetsubou-Sensei, while some eps are 'meh' quality the good ones are really something, I love the dark humour :)
Actually, I have a "mental list" of things that can be watched an endless amount of times and still love it. It's not huge, but it is there and I often indulge when there's not much I wanna see. This is excluding 'adult anime' for obvious reasons; I mean everyone has favs they come back for, yes?
Normally I re-watch anime when the episode count is around 26.
When it reaches somewhere around 50 I might re-watch it but most lickely not.
one it reached over a 100 episodes I do not rewatch it. (with the exception of One Piece - never gets old.)